A Novel Slotless Halbach-Array Permanent-Magnet Brushless DC Motor for Spacecraft Applications

Praveen, R. P.; Ravichandran, M.H.; Achari, V. T. Sadasivan; Raj, V P Jagathy; Madhu, G.; Bindu, G. R.

doi:10.1109/tie.2011.2161058

Cited by 89 publications

(30 citation statements)

References 11 publications

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“…These characteristics have led to the wide use of the Halbach array in portable Nuclear Magnetic Resonance (NMR) [15], in maglev vibration isolation units (MVIU) [16], and in brushless DC Motors for spacecraft applications [17]. However, its utilization in robotic climbers has not been widely studied to date.…”

Section: A Magnetic Adhesion Mechanismmentioning

confidence: 99%

Design of a teleoperated wall climbing robot for oil tank inspection

San-Millan

2015

2015 23rd Mediterranean Conference on Control and Automation (MED)

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This paper presents a climbing robot with wheeled locomotion which uses permanent magnets as adhesion mechanism. The robot designed is intended for the inspection of various types of ferromagnetic structures, such as ship hulls, wind turbine towers, bridges, and fuel tanks, in order to detect surface faults or cracks caused by, for example aging or atmospheric corrosion. The proposed robotic system consists of a cordless teleoperated mobile platform which can move on vertical ferromagnetic walls. The robot can be equipped with the various testing probes and cameras that are necessary for different inspection tasks. First, different prototypes of magnetic wall climbing robots are analyzed in order to establish the current state-of-the-art, and to provide the background required to analyse the main advantages and drawbacks of the prototypes presented. The design of the proposed robotic system is then explained, and details are provided of the new approach for the design of the permanent magnetic adhesion mechanism. Finally the mechanical and electrical construction, the control architecture implemented, and the human-machine interface for its control and teleoperation are presented too.

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Section: A Magnetic Adhesion Mechanismmentioning

confidence: 99%

Design of a teleoperated wall climbing robot for oil tank inspection

San-Millan

2015

2015 23rd Mediterranean Conference on Control and Automation (MED)

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“…4 does not use any ferromagnetic core with slots, the machine is free of cogging torque and core losses. In addition, the flux linkage harmonics due to iron stator slots and magnetic saturation are absent [18]- [20].…”

Section: B Suppression Of the Motor Magnetic Field Distribution Varimentioning

confidence: 99%

Analysis and Suppression of the Suspended Rotor Displacement Fluctuation Influence for Motor System

Zhou¹,

Fang

2014

IEEE Trans. Ind. Electron.

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Suspended rotor displacement fluctuation would result in unbalanced magnetic pull and inaccurate speed measurement, which degrades the suspended rotor stability and motor performance. In order to reduce the blight, some research studies have been conducted. First, the influence on the motor magnetic field has been analyzed between motors with iron-cored and coreless stator structures. It is found that with the coreless stator, the air-gap magnetic flux density variation can be neglected. Second, the law of the speed fluctuation caused by the rotor runout has been studied. In addition, two methods, which are based on the use of notch filter and speed correction, have been proposed for suppressing the fluctuation. Third, the performances of the closed-loop systems with the proposed speed fluctuation suppression methods have been analyzed. Finally, experimental results are presented to demonstrate the correctness of the analysis and the validity of the proposed methods.

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“…In order to increase the power density, many compound-structure PMSMs integrated by two machines have been proposed [25][26][27][28][29], but they are three-phase PM motors, which lack fault-tolerant capability. To combine the advantages of multiphase PM motors and compound-structure PM motors, a novel five-phase dual-rotor PMSM (DRPMSM) is proposed in this paper, which contains two rotors and one stator, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Investigation of a Five-Phase Dual-Rotor Permanent Magnet Synchronous Motor Used for Electric Vehicles

Zhao

Chen

et al. 2014

Energies

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This paper presents a novel five-phase permanent magnet synchronous motor (PMSM), which contains dual rotors and a single stator, equivalent to two five-phase motors working together. Thus, this kind of motor has the potential of good fault tolerant capability and high torque density, which makes it appropriate for use in electric vehicles. In view of the different connection types, the inside and outside stator windings can be driven in series or parallel, which results in the different performances of the magnetomotive force (MMF) and torque under open-circuit fault conditions. By decomposing the MMF, the reason that torque ripple increases after open-circuit faults is explained, and the relationship between MMF and torque is revealed. Then, the current control strategy is applied to adjust the open-circuit faults, and the electromagnetic analysis and MMF harmonics analysis are performed to interpret the phenomenon that the torque ripple is still larger than in the normal situation. The investigations are verified by finite element analysis results.

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A Novel Slotless Halbach-Array Permanent-Magnet Brushless DC Motor for Spacecraft Applications

Cited by 89 publications

References 11 publications

Design of a teleoperated wall climbing robot for oil tank inspection

Design of a teleoperated wall climbing robot for oil tank inspection

Analysis and Suppression of the Suspended Rotor Displacement Fluctuation Influence for Motor System

Investigation of a Five-Phase Dual-Rotor Permanent Magnet Synchronous Motor Used for Electric Vehicles

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